CVE-2026-86583Import and export users and customers <= 2.4.17 - Authenticated (Subscriber+) Privilege Escalation via CSV Escape-Character Mismatch in Export/Import Round Trip via display_name and nickname Profile Fields
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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The Import and export users and customers plugin for WordPress is vulnerable to Privilege Escalation in all versions up to, and including, 2.4.17 via the plugin's own export and re-import workflow. The vulnerability exists because the exporter writes CSV cells using fputcsv() with a NUL byte (\0) as the escape character, while the importer parses the same file using SplFileObject::fgetcsv() with only a single delimiter argument, causing PHP's default backslash escape character to be applied instead; because the export column layout places display_name immediately before the role column and nickname immediately after, an attacker can store crafted values in those two profile fields — saved by WordPress core via the standard profile page — such that the escape mismatch causes the parser to merge the display_name cell into the role field and rebalance the column count via nickname, yielding administrator as the parsed role for their own row when it reaches the import_user function's add_role function. This makes it possible for authenticated attackers with Subscriber-level access or above to escalate their privileges to Administrator. Exploitation requires a site administrator to trigger the plugin's documented export re-import migration with both "Update existing users" and "Update roles for existing users" set to "yes".
- CVSS
- 8.8 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- CWE-266
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Wordfence
- NVD analysis
- Deferred
- Record last updated
- Sep 24, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
carazo Import and export users and customers carazo:import_and_export_users_and_customers (from the name) | through 2.4.17 | CNA record |
References
- https://www.wordfence.com/threat-intel/vulnerabilities/id/5b0f3444-4c10-45ce-a00b-4ed6038b8846?source=cve
- https://plugins.trac.wordpress.org/browser/import-users-from-csv-with-meta/tags/2.4.17/classes/import.php#L888
- https://plugins.trac.wordpress.org/browser/import-users-from-csv-with-meta/tags/2.4.17/classes/import.php#L1356
- https://plugins.trac.wordpress.org/browser/import-users-from-csv-with-meta/tags/2.4.17/classes/batch_exporter.php#L459
- https://plugins.trac.wordpress.org/browser/import-users-from-csv-with-meta/tags/2.4.17/classes/import.php#L872
- https://plugins.trac.wordpress.org/browser/import-users-from-csv-with-meta/tags/2.4.17/classes/helper.php#L78
- https://plugins.trac.wordpress.org/changeset/3687349/import-users-from-csv-with-meta
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.